I'm not sure where the Orca screen magnifier went. But it never behaved well. Was very slow and unwieldy. I find this magnifier is a much better alternative:
It is easy to install, just follow the directions. To make it easy to use, I use a custom launcher shortcut of ctrl - alt - m.
You can also put a custom launcher in the Unity launcher bar if you want:
create a file called magnifier.desktop and open it with gedit and paste in the following:
Then save it on the desktop, and drag the file onto the launcher bar, or into /usr/share/applications (for all users) or ~/.local/share/applications (for a single user) via
GenericName[en_US.UTF-8]=Launch a screen magnifier
Comment[en_US.UTF-8]=Terminal-based text-only web browser
sudo cp Desktop/magnifier.desktop /usr/share/applications/
Too bad it's not in the repositories already! Would be wonderful for Orca developers to integrate it in their project.
sudo cp Desktop/magnifier.desktop .local/share/applications/